Bicycle frame



FIG. 1 is a front, top, left perspective view of a bicycle frame showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines of even length shown in the drawings illustrate portions of the bicycle frame that form no part of the claimed design. The broken lines of uneven length shown in the drawings illustrate the boundary of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 